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.. but not including the Aston Martin DB5. Don't know if it had an electric fuel pump. If it was mechanical, it would have continued to pull gas into the cylinders after the sparks were shut off.

If it was a mechanical fuel pump with carbs, wouldn't that mean revving the engine when turning it off leave more fuel in the intake and cylinders since the only thing turned off by the key would be ignition?

If it was a mechanical fuel pump with carbs, wouldn't that mean revving the engine when turning it off leave more fuel in the intake and cylinders since the only thing turned off by the key would be ignition?

Yes, exactly. Seems like it was never a good idea, if it was to do with keeping gas out of a stopped engine. Unless it was an electric fuel pump. But I think it was just style, like smoking all the time and leaving half-finished drinks with huge tips on the bar.

carbon build up is 1st issue to apex seals not due to high rev. redlining is suggest when driving a rotary engine since it clears out the engine. ever wonder how Mazda won Le Mans before they started to ban rotary engines?

carbon build up is 1st issue to apex seals not due to high rev. redlining is suggest when driving a rotary engine since it clears out the engine. ever wonder how Mazda won Le Mans before they started to ban rotary engines?

I just thought it was funny because I haven't thought of an apex seal since my buddy had his FB RX-7 back in high school. I feel like we disassembled the engine to do apex seals on that damn thing every month

The reason is to clear fuel from the cylinders. It has the added benefit of making intimidating engine noises to scare potential competitors (either at the valet or the race track). Needless on cars with EFI since at most you'll have one combustion cycle worth of fuel in the cylinder which will evaporate within seconds in a still hot engine.

No, and it has nothing to do with no return line from the fuel rail. Shanneba gave a good explanation, and the key words to acknowledge are emission optimized. Letting gasoline evaporate is wasteful and is not good for the environment.

Wrong/ the burn off feature on ms 43 has render the return line from the fuel rail obsolete .